US Bridges

FAU 3607 over Mackey Branch

Fair

Hamilton County, Tennessee · In Chattanooga · Structure no. 33036070001

Built
1985
40 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
7,209
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

FAU 3607 over Mackey Branch is a concrete continuous culvert carrying FAU 3607 over Mackey Branch in Hamilton County, Tennessee. It was built in 1985, so it is 40 years old, younger than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 7,209 vehicles a day, roughly 4% of them trucks, projected to reach 11,534 by 2042. The structure is 31 ft (9.3 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFAU 3607
CrossesMackey Branch
LocationIn Chattanooga
RouteCity Street 3607
CountyHamilton County
StateTennessee
Coordinates35.02327, -85.1399
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length31 ft (9.3 m)
Longest span12 ft (3.7 m)
Deck width33 ft (10 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,209 (2021)
Projected traffic11,534 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$323,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAU 3607 over Mackey Branch built?

It was built in 1985, making it 40 years old in 2025.

What condition is FAU 3607 over Mackey Branch in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does FAU 3607 over Mackey Branch carry?

About 7,209 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is FAU 3607 over Mackey Branch?

The structure is 31 ft (9.3 m) long with a longest span of 12 ft (3.7 m) and a deck 33 ft wide.

Who owns FAU 3607 over Mackey Branch?

It is owned by the City or Municipal Highway Agency.